Search for Narrow Resonance Decaying to Muon Pairs in 2.3 fb-1

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Search for Narrow Resonance Decaying to Muon Pairs in 2.3 fb-1 Ye Li on behalf of CDF Collaboration University of Wisconsin-Madison

APS April Meeting, St. Louis - 14 April 2008 Motivation Theory Driven Standard Model successful but incomplete Strong discovery potential in dimuon channel New models predict narrow neutral resonance, e.g. Additional U(1) symmetry: Z’ Extra space-time dimension: Randall-Sundrum graviton Focus on Z’ →  channel Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Motivation Experiment Driven Last Tevatron dimuon resonance searches performed with integrated luminosity 200 pb-1 → Our search: L ≈ 2.3 fb-1 of CDF Run II data Significant increase of sensitivity to dielectron and diphoton channels Excellent tracking resolution (Central Outer Tracker, Drift Chamber) Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Methodology Model Drell-Yan background and signal resonance with PYTHIA + detector simulation Use Z region for normalization Remove uncertainty on luminosity Easy accounting Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Methodology Inverse Mass (1/m) Scan Excellent angular resolution → negligible High PT track curvature (~1/PT) resolution constant → constant 1/m resonance width CDF Run II Preliminary 1/m ≈ 0.16/TeV Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Methodology Fit for NZ’ (number of Z’ candidate) Calculate Binned Poisson likelihood L(NZ’;MZ’) for region 1/m < 10/TeV Construct the narrowest possible interval in NZ’ at 95% C.L. Scan for resonance Significance determined by Monte-Carlo pseudo-experiments Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Dataset & Selection Dataset from high PT muon trigger Dimuon event selection Two opposite-sign tight muons At least one muon passing the trigger CDF Run II Preliminary Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Efficiency Mass dependence Track and muon-hit cuts independent of mass Momentum dependence Normalization of background expectation Only consider P dependence No P dependence of trigger eff. for PT > 30 GeV Separate the sample into signal and normalization (Z-pole) regions Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Acceptance Comparison of muon  in W →  data vs. simulation for two muon detector regions CDF Run II Preliminary || < 0.6 (CMUP) 0.6 < || < 1.0 (CMX) Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Acceptance Mass-dependent Acceptance Larger mass → Lower boost → More central events → Larger acceptance CDF Run II Preliminary Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Background Drell-Yan */Z →  PYTHIA + Simulation WW and tt-bar Cosmic Rays Identified Cosmic-ray samples QCD Jets and Decays-in-Flight Data Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Drell-Yan Dominant source for background Dominant source for systematic uncertainty Mass spectrum affected by higher-order corrections Calculate up to next-to-next-to leading order (NNLO) correction → k-factor Different Calculations give different k-factors Average k-factor; Difference as uncertainty Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Signal Scan Pseudo-experiment: MZ’ = 250 GeV CDF Run II Preliminary Most likely distribution of NZ’ Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Signal Scan Expected limits on NZ’ from 1000 pseudo-experiments on 50 Z’ masses Data: to be implemented …! CDF Run II Preliminary Ye Li APS April Meeting, St. Louis - 14 April 2008

APS April Meeting, St. Louis - 14 April 2008 Summary Use 1/m distribution for constant resolution to search for Z’ Fitter and Simulation in place to study signal acceptance and identification efficiency Systematic uncertainties to be determined Signal scan performed on pseudo-experiments Ready to unblind the data soon Ye Li APS April Meeting, St. Louis - 14 April 2008